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Best Practices - Exception Handling Mechanism

 
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Guys,

I have a persistence layer which looks up a JNDI datasource and executes the SQL queries. So in effect, all the persistence methods that I have should handle NamingException and SQLException. Now what would be the best practice to the caller which is usually my middle tier to handle such exceptions? or do I handle them in my persistence layer and throw another generic exception to my service?
 
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Personally, I'd throw some sort of persistence exception to the next layer up.
 
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